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CVE-2025-54490

Estado: ModificadaCrítica (9.8)—

A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.This vulnerability manifests on line 9090 of biosig.c on the current master branch (35a819fa), when the Tag is 64:

In this case, the overflowed buffer is the newly-declared `tmp` \[1\] instead of `buf`. While `tmp` is larger than `buf`, having a size of 256 bytes, a stack overflow can still occur in cases where `len` is encoded using multiple octets and is greater than 256.

Detalles técnicos trazas, registros y código del informe original
                else if (tag==64)     //0x40
                {
                    // preamble
                    char tmp[256];  // [1]
                    curPos += ifread(tmp,1,len,hdr);

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Buffer overflow remoto en parsing de archivo MFER sin autenticación (AV:N, PR:N, UI:N). Acceso de red sin privilegios previos mapea a T1190. Desbordamiento permite ejecución arbitraria de código (CWE-121, biosig.c línea 9090).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

Libbiosig Project — Libbiosig

CWE

Referencias

JSON original (NVD)

Mostrar
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  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "id": "CVE-2025-54490",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
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          "timestamp": "2025-08-25T18:57:19.946118Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
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          "attackComplexity": "LOW",
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          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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          "versions": [
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  "published": "2025-08-25T14:15:35.420",
  "references": [
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      "tags": [
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        "Third Party Advisory"
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      "value": "A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.This vulnerability manifests on line 9090 of biosig.c on the current master branch (35a819fa), when the Tag is 64:\r\n\r\n                else if (tag==64)     //0x40\r\n                {\r\n                    // preamble\r\n                    char tmp[256];  // [1]\r\n                    curPos += ifread(tmp,1,len,hdr);\r\n\r\nIn this case, the overflowed buffer is the newly-declared `tmp` \\[1\\] instead of `buf`. While `tmp` is larger than `buf`, having a size of 256 bytes, a stack overflow can still occur in cases where `len` is encoded using multiple octets and is greater than 256."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de desbordamiento de búfer en la pila en la funcionalidad de análisis MFER de The Biosig Project libbiosig 3.9.0 y Master Branch (35a819fa). Un archivo MFER especialmente manipulado puede provocar la ejecución de código arbitrario. Un atacante puede proporcionar un archivo malicioso para activar esta vulnerabilidad. Esta vulnerabilidad se manifiesta en la línea 9090 de biosig.c en la rama maestra actual (35a819fa), cuando la etiqueta es 64: else if (tag==64) //0x40 { // preámbulo char tmp[256]; // [1] curPos += ifread(tmp,1,len,hdr); En este caso, el búfer desbordado es el recién declarado `tmp` \\[1\\] en lugar de `buf`. Si bien `tmp` es más grande que `buf`, con un tamaño de 256 bytes, aún puede ocurrir un desbordamiento de pila en los casos en que `len` se codifica utilizando múltiples octetos y es mayor a 256."
    }
  ],
  "lastModified": "2026-06-17T09:40:11.943",
  "configurations": [
    {
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        {
          "negate": false,
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              "versionEndExcluding": "3.9.1"
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  "sourceIdentifier": "talos-cna@cisco.com"
}